<?php
    define('DB_HOST', 'localhost');
    define('DB_USER', 'root');
    define('DB_PASS', '123456');
    define('DB_NAME', 'review_app');

    //新建连接
    $conn = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);

    //检查链接
    if ($conn->connect_error){
        die('连接失败'. $conn->connect_error);
    }

    echo "连接成功";